<template>
  <div ref="wrapper" class="wrapper">
    <slot>需要scroll的content</slot>
  </div>
</template>

<script>
import BScroll from 'better-scroll'

export default {
  props: {
    probeType: { type: Number, default: 1 },
    click: { type: Boolean, default: true },
    data: { type: Array, default: null },
    listenScroll: { type: Boolean, default: false },
    pullup: { type: Boolean, default: false },
    refreshDelay: { type: Number, default: 20 },
    beforeScroll: { type: Boolean, default: false }
  },
  mounted() {
    this._initScroll()
  },
  methods: {
    _initScroll() {
      if (!this.$refs.wrapper) {
        return
      }
      this.scroll = new BScroll(this.$refs.wrapper, {
        probeType: this.probeType,
        click: this.click
      })
      // console.log('scoll绑定的wrapper', this.scroll)
      if (this.listenScroll) {
        let _this = this
        this.scroll.on('scroll', pos => {
          _this.$emit('scroll', pos)
        })
      }
      if (this.pullup) {
        this.scroll.on('scrollEnd', () => {
          if (this.scroll.y <= this.scroll.maxScrollY + 50) {
            this.$emit('scrollToEnd')
          }
        })
      }
      if (this.beforeScroll) {
        this.scroll.on('beforeScrollStart', () => {
          this.$emit('beforeScroll')
        })
      }
    },
    enable() {
      this.scroll && this.scroll.enable()
    },
    disable() {
      this.scroll && this.scroll.disable()
    },
    refresh() {
      this.scroll && this.scroll.refresh()
    },
    scrollTo() {
      this.scroll && this.scroll.scrollTo.apply(this.scroll, arguments)
    },
    scrollToElement() {
      this.scroll && this.scroll.scrollToElement.apply(this.scroll, arguments)
    }
  },
  watch: {
    data() {
      setTimeout(() => {
        this.refresh()
      }, this.refreshDelay)
    }
  }
}
</script>

<style lang="stylus" scope>
.wrapper
  // position absolute
  // left 0
  // top 0
  overflow hidden
</style>
